I don't think you can do this as this is an outstanding feature request which has not been implemented yet - https://jira.atlassian.com/browse/GHS-806
You can specify non-working days via JIRA Administration -> Greenhopper -> Non-working Days (http://confluence.atlassian.com/display/GH038/Configuring+your+GreenHopper+Global+Settings) , but if you specify the number of working days in a week to be 5 in JIRA Administration -> System -> Issue Features -> Time Tracking (http://confluence.atlassian.com/display/JIRA/Configuring+Time+Tracking) then JIRA and therefore Greenhopper will assume that the working week is Monday - Friday.
Might be worth voting on https://jira.atlassian.com/browse/GHS-806 to try and get this feature implemented?
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
Hi Atlassian Community! My name is Shana, and I’m on the Jira Software team. One of the many reasons this Community exists is to connect you to others on similar product journeys or with comparabl...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs